benjick

Add a Google+ Page button easily with this plugin. The shortcode is <code>[googlepage]</code>
Usage: 
* Smallest icon: <code>[googlepage page=YOUR_PAGE_ID]</code> 
* Medium icon: <code>[googlepage size=32 page=YOUR_PAGE_ID]</code> 
* Biggest icon: <code>[googlepage size=64 page=YOUR_PAGE_ID]</code>
In page=x where x is your Google+ Page number.

Google Plus Page shortcode

This plugin allows you to add links to a Google+ Page with simple shortcode

Patrick Chia

This plugin allows you to generate a <a href="https://plus.google.com/" rel="nofollow ugc">Google+</a> favicon for your blog and admin logo included Apple touch icon. Activate the plugin, and it will add G+ photo to your blog template and admin panel automatically.

Google Plus Favicon

Simply add a Google+ account ID to generate a G+ favicon for your blog and admin logo included Apple touch icon.

Google Plus Page shortcode vs Google Plus Favicon